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WikiPedia: Optimisme http://www.oxforddictionaries.com/definition/engli... //pubmed.ncbi.nlm.nih.gov/22153158 //pubmed.ncbi.nlm.nih.gov/26561494 //www.ncbi.nlm.nih.gov/pmc/articles/PMC4637169 //doi.org/10.1016%2Fj.cub.2011.10.030 //doi.org/10.1080%2F17439760.2015.1015155 https://www.merriam-webster.com/dictionary/optimis... https://d-nb.info/gnd/4043665-2 https://archive.org/details/isbn_9780312658854 https://archive.org/details/psychologyapplie00weit...